CN110429628A - A kind of valley-fill method and device of energy storage based on load self-adapting - Google Patents

A kind of valley-fill method and device of energy storage based on load self-adapting Download PDF

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Publication number
CN110429628A
CN110429628A CN201910733704.2A CN201910733704A CN110429628A CN 110429628 A CN110429628 A CN 110429628A CN 201910733704 A CN201910733704 A CN 201910733704A CN 110429628 A CN110429628 A CN 110429628A
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China
Prior art keywords
fills
energy storage
load
energy
fill
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Pending
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CN201910733704.2A
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Chinese (zh)
Inventor
毛田
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CSG Electric Power Research Institute
China Southern Power Grid Co Ltd
Research Institute of Southern Power Grid Co Ltd
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China Southern Power Grid Co Ltd
Research Institute of Southern Power Grid Co Ltd
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Priority to CN201910733704.2A priority Critical patent/CN110429628A/en
Publication of CN110429628A publication Critical patent/CN110429628A/en
Pending legal-status Critical Current

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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32Arrangements for balancing of the load in a network by storage of energy using batteries with converting means

Abstract

The invention discloses a kind of valley-fill methods of the energy storage based on load self-adapting, which comprises acquires the load condition data of prediction and the state-of-charge and energy storage characteristic of the energy-storage battery;According to the load condition data of the prediction, the state-of-charge and energy storage characteristic of energy-storage battery, the load filling time point and filling numerical value of the energy-storage battery are calculated;It is charged according to the load filling time point of the energy-storage battery and filling numerical value to the energy-storage battery.The present invention also provides a kind of valley-fill devices of the energy storage based on load self-adapting.Using the present invention, it can reasonably optimize charging modes when energy storage filling low ebb load.

Description

A kind of valley-fill method and device of energy storage based on load self-adapting
Technical field
The present invention relates to stored energy application technical fields, more particularly to a kind of valley-fill method of the energy storage based on load self-adapting And device.
Background technique
Energy storage can be filled as one kind can put, call flexible power equipment, to promotion electric system flexibility, support distribution Formula power generation promotes new energy consumption, promotion production of energy to consume opening and shares etc. and be all of great significance.Wherein, energy storage peak clipping Valley-fill is one of important application of energy storage, and by way of being discharged when charging, load peak in load valley, energy storage can be very big Optimize network load status data curve, improve network load characteristic, it is significant for promoting electric network security.Energy storage is cut Peak load optimizes calculating, and sustainable energy storage preferably participates in peak load shifting, promotes benefit of the energy storage in practical power generation With.
In existing energy storage peak load shifting method, most of constraint condition by fining building energy storage, including it is charged State SOC (State-of-charge, state-of-charge) constraint, front and back moment SOC constraint, charge power constraint etc., in conjunction with negative The charge and discharge that lotus status data curve carries out energy storage peak load shifting is electrically optimized, and calculating is not easy enough, while being also required to using heuristic Algorithm or calculating instrument are solved.
Summary of the invention
To solve the above-mentioned problems, the object of the present invention is to provide a kind of valley-fill method of the energy storage based on load self-adapting, Charging modes when energy storage filling low ebb load can reasonably be optimized.
Based on this, the present invention provides a kind of valley-fill methods of the energy storage based on load self-adapting, which comprises
Acquire the load condition data of prediction and the state-of-charge and energy storage characteristic of the energy-storage battery;
According to the load condition data of the prediction, the state-of-charge and energy storage characteristic of energy-storage battery, the energy storage is calculated The load filling time point and filling numerical value of battery;
It is charged according to the load filling time point of the energy-storage battery and filling numerical value to the energy-storage battery;
Wherein, according to the load condition data of the prediction, the state-of-charge and energy storage characteristic of energy-storage battery, described in calculating The load filling time point and filling numerical value of energy-storage battery, comprising:
Obtain energy storage charge threshold PIt fills
The chargeable electricity Q of energy storage is obtained according to load condition data and curvesSum- fills
Charge capacity Q needed for obtaining energy storageES fills
According to QSum- fillsAnd QES fillsIteration judgement and update PIt fills
Wherein, the acquisition energy storage charge threshold PIt fillsInclude:
Obtain load valley threshold value P1
It obtains and load valley threshold value P1The power of pre-determined distance and time point;
According to load condition data and curves, the minimum value P of load is obtainedmin
According to the P1And Pmin, obtain energy storage charge threshold PIt fillsInitial value.
Wherein, described to obtain the chargeable electricity Q of energy storage according to load condition data and curvesSum- fillsInclude:
Wherein, PESFor the specified charge power of energy storage, PtLoad corresponding to load condition data and curves when for moment t Value, charging section are [tIt fills, 0, tIt fills, 1], wherein tIt fills, 0And tIt fills, 1It is P for load status data curve performance numberIt fillsOr and PIt fillsAt a distance of pre- If the time point of distance, and tIt fills, 0<tIt fills, 1
Wherein, charge capacity Q needed for the acquisition energy storageES fillsInclude:
QES fills=PES×(SOCmax-SOCInitially)/ηIt fills
Wherein, SOCmaxAnd SOCInitiallyRespectively correspond the maximum allowable SOC of energy storage and initial SOC value;ηIt fillsFor filling for corresponding energy storage Electrical efficiency.
Wherein, described according to QSum- fillsAnd QES fillsIteration judgement and update PIt fills, comprising:
If QSum- fillsLess than QES fills, it was demonstrated that press PIt fillsThe chargeable electricity that the charge threshold of setting obtains is unable to satisfy energy storage and fills Electricity demanding then increases P by pre- fixed step size δIt fills, i.e. PIt fills=PIt fills+δ;
If QSum- fillsNot less than QES fills, it was demonstrated that press PIt fillsThe chargeable electricity that the charge threshold of setting obtains can satisfy energy storage Charge requirement need to reduce P by pre- fixed step size δIt fills, i.e. PIt fills=PIt fills- δ is further calculated and is judged QSum- fillsAnd QES fillsSize close System, and then determine PIt fillsFinal value.
Wherein, the P is obtainedIt fillsAfter final value, according to PIt fillsObtain each moment charge power P of energy storageFill-t:
According to each moment PFill-tDetermine the SOC value SOC after energy storage is valley-fillIt is valley-fill, t:
Wherein, CESFor the rated capacity of energy-storage battery.
The embodiment of the invention also provides a kind of valley-fill device of the energy storage based on load self-adapting, described device includes:
Acquisition module, for acquiring the load condition data of prediction and state-of-charge and the energy storage spy of the energy-storage battery Property;
Computing module, for the state-of-charge and energy storage characteristic according to the load condition data of the prediction, energy-storage battery, Calculate the load filling time point and filling numerical value of the energy-storage battery;
Charging module, for the load filling time point and filling numerical value according to the energy-storage battery to the energy-storage battery It charges.
The embodiment of the invention also provides a kind of valley-fill equipment, including processor, memory and it is stored in the storage In device and it is configured as the computer program executed by the processor, the processor is realized when executing the computer program The above-mentioned valley-fill method of the energy storage based on load self-adapting.
The embodiment of the invention also provides a kind of computer readable storage medium, the computer readable storage medium includes The computer program of storage, wherein control in computer program operation and set where the computer readable storage medium It is standby to execute the valley-fill method of the above-mentioned energy storage based on load self-adapting.
, can be in conjunction with load condition data, energy-storage battery SOC and energy-storage battery operation characteristic using the present invention, it can The adaptive charging modes for solving energy storage and being directed to low ebb load.Since the valley-fill method of energy storage has fully considered that load condition data are bent Line, battery status and battery items constraint condition, therefore charging when low ebb load is filled in energy storage can be optimized relatively reasonablely Mode, and calculate succinct, convenient, participate in that load is valley-fill to provide a kind of effective means for energy-storage battery.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with It obtains other drawings based on these drawings.
Fig. 1 is a kind of flow chart of the valley-fill method of energy storage based on load self-adapting provided in an embodiment of the present invention;
Fig. 2 is a kind of structural schematic diagram of the valley-fill method of energy storage based on load self-adapting provided in an embodiment of the present invention;
Fig. 3 is the valley-fill calculating schematic diagram of energy-storage battery load provided in an embodiment of the present invention;
Fig. 4 is the SOC status diagram after energy-storage battery load provided in an embodiment of the present invention is valley-fill;
Fig. 5 is a kind of schematic diagram of the valley-fill device of energy storage based on load self-adapting provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other Embodiment shall fall within the protection scope of the present invention.
Fig. 1 is a kind of schematic diagram of the valley-fill method of energy storage based on load self-adapting provided in an embodiment of the present invention, described Method includes:
The state-of-charge and energy storage characteristic of S101, the load condition data of acquisition prediction and the energy-storage battery;
Fig. 2 is a kind of structural schematic diagram of the valley-fill method of energy storage based on load self-adapting provided in an embodiment of the present invention, Referring to FIG. 2, the acquisition modes of the load condition data of the prediction include with substation or area power grid interface to obtaining Take preset load condition data, state-of-charge, that is, SOC (State-of-charge) of the energy-storage battery, the energy storage electricity The energy storage characteristic in pond includes energy storage power, capacity, SOC operation bound, efficiency for charge-discharge etc..
S102, according to the load condition data of the prediction, the state-of-charge and energy storage characteristic of energy-storage battery, described in calculating The load filling time point and filling numerical value of energy-storage battery;
Step 1 can be made into load condition data and curves according to the load condition data of the prediction, according to the load shape State data and curves assumed load low ebb threshold value P1, for example, the load valley threshold value can be set as the specified function of transformer The 50% of rate is also possible to the 40% of the load condition data and curves, can also independently set.
Obtain the load valley threshold value P1Later, it is also necessary to which obtaining the load condition data and curves performance number is P1Or With the P1P is closed at a distance of the power of the predetermined number of pre-determined distance and time point1Power and time point, it is assumed that be (P1, t0) and (P1,t1).Wherein, t0And t1For corresponding time point.Load minimum value is obtained according to the load condition data and curves Pmin, and set energy storage charge threshold PIt fillsInitial value:
PIt fills=(P1+Pmin)/2
Step 2 obtains the chargeable electricity Q of energy storage according to the load condition data and curvesSum- fills, when load value is lower than PIt fills When, setting energy storage charges and calculates charge power, specific formula are as follows:
Wherein, PESFor the specified charge power of energy storage, PtIt is born corresponding to the load condition data and curves when for moment t Charge values, charging section are [tIt fills, 0, tIt fills, 1], tIt fills, 0And tIt fills, 1Performance number for the load condition data and curves is PIt fillsOr close on PIt fills Time point, and tIt fills, 0<tIt fills, 1
Charge capacity Q needed for step 3, calculating energy storageES fillsAre as follows:
QES fills=PES×(SOCmax-SOCInitially)/ηIt fills
Wherein, the SOCmaxAnd SOCInitiallyRespectively correspond the maximum allowable SOC of energy storage and initial SOC value, ηIt fillsCorresponding energy storage Charge efficiency.
Step 4, according to QSum- fillsAnd QES fillsIteration judgement and update PIt fills:
If A, QSum- fillsLess than QES fills, it was demonstrated that press PIt fillsThe chargeable electricity that the charge threshold of setting obtains is unable to satisfy energy storage Charge requirement then increases P by pre- fixed step size δIt fills, i.e. PIt fills=PIt fills+ δ, going to step 2 is handled;
If B, QSum- fillsNot less than QES fills, it was demonstrated that PIt fillsIt can satisfy storage by the chargeable electricity that the charge threshold of setting obtains Energy charge requirement need to reduce P by pre- fixed step size δIt fills, i.e. PIt fills=PIt fills- δ recalculates QSum- fillsAnd QES fills, judge whether to meet QSum- fillsLess than QES fills
If QSum- fillsLess than QES fills, go to step 5;
If QSum- fillsNot less than QES fills, go to step 2.
Step 5 obtains final PIt fillsFor P obtained in step 4It fillsIn addition step-length δ, i.e. PIt fills=PIt fills+δ.It is determined according to final PIt fillsObtain each moment charge power P of energy storageFill-t:
According to each moment PFill-tDetermine the SOC value SOC after energy storage is valley-fillIt is valley-fill, t:
Wherein, CESFor the rated capacity of energy-storage battery.
S103, the energy-storage battery is filled according to the load filling time point and filling numerical value of the energy-storage battery Electricity.
, can be in conjunction with load condition data, energy-storage battery SOC and energy-storage battery operation characteristic using the present invention, it can The adaptive load filling mode for solving energy storage and being directed to low ebb load.Since the valley-fill method of energy storage has fully considered load condition number According to curve, battery status and battery items constraint condition, thus can optimize relatively reasonablely energy storage filling low ebb load when Charging modes, and calculate succinct, convenient, participate in that load is valley-fill to provide a kind of effective means for energy-storage battery.
By taking certain energy-storage battery participates in the filling of certain substation's low ebb load as an example, it is assumed that P1It is set as the specified function of 50% transformer Rate, Fig. 3 give the valley-fill calculating schematic diagram of energy-storage battery load, Fig. 4 give energy-storage battery load it is valley-fill after SOC state show It is intended to, energy storage design parameter such as following table.
It can be seen that energy storage from Fig. 2 Comparative result to be charged in the load valley period, after energy storage is valley-fill when former low ebb The load of section increases and obtained Load results maintain phase same level, it was demonstrated that mentioned method optimizes the charging time of energy storage And charge power;Fig. 3 the result shows that, energy storage SOC and charge power limit in range in energy storage, show that mentioned method is able to satisfy The operation characteristic and technical characteristic of energy-storage battery.Thus prove that the present invention can optimize energy storage filling low ebb load relatively reasonablely When charging modes.
Fig. 5 is a kind of schematic diagram of the valley-fill device of energy storage based on load self-adapting provided in an embodiment of the present invention, described Device includes:
Acquisition module 501, for acquiring the load condition data of prediction and state-of-charge and the energy storage of the energy-storage battery Characteristic;
Computing module 502, for special according to the load condition data of the prediction, the state-of-charge of energy-storage battery and energy storage Property, calculate the load filling time point and filling numerical value of the energy-storage battery.
Charging module 503, for the load filling time point and filling numerical value according to the energy-storage battery to the energy storage Battery charges.
Technical characteristic and the technology effect for the valley-fill device of a kind of energy storage based on load self-adapting that the embodiment of the present invention proposes Fruit is identical as the method that the embodiment of the present invention proposes, it will not be described here.
The embodiment of the invention also provides a kind of valley-fill equipment, including processor, memory and it is stored in the storage In device and it is configured as the computer program executed by the processor, the processor is realized when executing the computer program The above-mentioned valley-fill method of the energy storage based on load self-adapting.
The embodiment of the invention also provides a kind of computer readable storage mediums, which is characterized in that described computer-readable Storage medium includes the computer program of storage, wherein in computer program operation, controls described computer-readable deposit Equipment executes such as the valley-fill method of the above-mentioned energy storage based on load self-adapting where storage media.
Expression or logic and/or step described otherwise above herein in flow charts, for example, being considered use In the order list for the executable instruction for realizing logic function, may be embodied in any computer-readable medium, for Instruction execution system, device or equipment (such as computer based system, including the system of processor or other can be held from instruction The instruction fetch of row system, device or equipment and the system executed instruction) it uses, or combine these instruction execution systems, device or set It is standby and use.For the purpose of this specification, " computer-readable medium ", which can be, any may include, stores, communicates, propagates or pass Defeated program is for instruction execution system, device or equipment or the dress used in conjunction with these instruction execution systems, device or equipment It sets.
The more specific example (non-exhaustive list) of computer-readable medium include the following: there are one or more wirings Electrical connection section (electronic device), portable computer diskette box (magnetic device), random access memory (RAM), read-only memory (ROM), erasable edit read-only storage (EPROM or flash memory), fiber device and portable optic disk is read-only deposits Reservoir (CDROM).In addition, computer-readable medium can even is that the paper that can print described program on it or other are suitable Medium, because can then be edited, be interpreted or when necessary with it for example by carrying out optical scanner to paper or other media His suitable method is handled electronically to obtain described program, is then stored in computer storage.
It should be appreciated that each section of the invention can be realized with hardware, software, firmware or their combination.Above-mentioned In embodiment, software that multiple steps or method can be executed in memory and by suitable instruction execution system with storage Or firmware is realized.It, and in another embodiment, can be under well known in the art for example, if realized with hardware Any one of column technology or their combination are realized: having a logic gates for realizing logic function to data-signal Discrete logic, with suitable combinational logic gate circuit specific integrated circuit, programmable gate array (PGA), scene Programmable gate array (FPGA) etc..
It should be noted that, in this document, the relational terms of such as " first " and " second " or the like are used merely to one A entity or operation with another entity or operate distinguish, without necessarily requiring or implying these entities or operation it Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant are intended to Cover non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes those Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or setting Standby intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that There is also other identical elements in the process, method, article or apparatus that includes the element.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art For member, without departing from the technical principles of the invention, several improvement and replacement can also be made, these are improved and replacement Also it should be regarded as protection scope of the present invention.

Claims (10)

1. a kind of valley-fill method of energy storage based on load self-adapting characterized by comprising
Acquire the load condition data of prediction and the state-of-charge and energy storage characteristic of the energy-storage battery;
According to the load condition data of the prediction, the state-of-charge and energy storage characteristic of energy-storage battery, the energy-storage battery is calculated Load filling time point and filling numerical value;
It is charged according to the load filling time point of the energy-storage battery and filling numerical value to the energy-storage battery.
2. the valley-fill method of energy storage as described in claim 1 based on load self-adapting, which is characterized in that according to the negative of the prediction The state-of-charge and energy storage characteristic of lotus status data, energy-storage battery calculate the load filling time point of the energy-storage battery and fill out It makes up the number value, comprising:
Obtain energy storage charge threshold PIt fills
The chargeable electricity Q of energy storage is obtained according to load condition data and curvesSum- fills
Charge capacity Q needed for obtaining energy storageES fills
According to QSum- fillsAnd QES fillsIteration judgement and update PIt fills
3. the valley-fill method of energy storage as claimed in claim 2 based on load self-adapting, which is characterized in that the acquisition energy storage charging Threshold value PIt fillsInclude:
Obtain load valley threshold value P1
It obtains and load valley threshold value P1The power of pre-determined distance and time point;
According to load condition data and curves, the minimum value P of load is obtainedmin
According to the P1And Pmin, obtain energy storage charge threshold PIt fillsInitial value.
4. the valley-fill method of energy storage as claimed in claim 2 based on load self-adapting, which is characterized in that described according to load condition Data and curves obtain the chargeable electricity Q of energy storageSum- fillsInclude:
Wherein, PESFor the specified charge power of energy storage, PtLoad value corresponding to load condition data and curves, fills when for moment t Electric section is [tIt fills, 0, tIt fills, 1], wherein tIt fills, 0And tIt fills, 1It is P for load status data curve performance numberIt fillsOr and PIt fillsAt a distance of it is default away from From time point, tIt fills, 0<tIt fills, 1
5. the valley-fill method of energy storage as claimed in claim 2 based on load self-adapting, which is characterized in that needed for the acquisition energy storage Charge capacity QES fillsInclude:
QES fills=PES×(SOCmax-SOCInitially)/ηIt fills
Wherein, SOCmaxAnd SOCInitiallyRespectively correspond the maximum allowable SOC of energy storage and initial SOC value;ηIt fillsFor the charging effect of corresponding energy storage Rate.
6. the valley-fill method of energy storage as claimed in claim 2 based on load self-adapting, which is characterized in that described according to QSum- fillsWith QES fillsIteration judgement and update PIt fills, comprising:
If QSum- fillsLess than QES fills, it was demonstrated that press PIt fillsThe chargeable electricity that the charge threshold of setting obtains is unable to satisfy energy storage charging and needs It asks, then increases P by pre- fixed step size δIt fills, i.e. PIt fills=PIt fills+δ;
If QSum- fillsNot less than QES fills, it was demonstrated that press PIt fillsThe chargeable electricity that the charge threshold of setting obtains can satisfy energy storage charging and need It asks, P need to be reduced by pre- fixed step size δIt fills, i.e. PIt fills=PIt fills- δ is further calculated and is judged QSum- fillsAnd QES fillsSize relation, in turn Determine PIt fillsFinal value.
7. the valley-fill method of energy storage as claimed in claim 6 based on load self-adapting, which is characterized in that obtain the PIt fillsFinally take After value, according to PIt fillsObtain each moment charge power P of energy storageFill-t:
And PIt fills>Pt
According to each moment PFill-tDetermine the SOC value SOC after energy storage is valley-fillIt is valley-fill, t:
Wherein, CESFor the rated capacity of energy-storage battery.
8. a kind of valley-fill device of energy storage based on load self-adapting characterized by comprising
Acquisition module, for acquiring the load condition data of prediction and the state-of-charge and energy storage characteristic of the energy-storage battery;
Computing module is calculated for the state-of-charge and energy storage characteristic according to the load condition data of the prediction, energy-storage battery The load filling time point and filling numerical value of the energy-storage battery;
Charging module, for being carried out according to the load filling time point and filling numerical value of the energy-storage battery to the energy-storage battery Charging.
9. a kind of valley-fill equipment, including processor, memory and storage in the memory and are configured as by described The computer program that device executes is managed, the processor is realized when executing the computer program as any one in claim 1 to 7 The valley-fill method of the energy storage based on load self-adapting described in.
10. a kind of computer readable storage medium, which is characterized in that the computer readable storage medium includes the calculating of storage Machine program, wherein equipment where controlling the computer readable storage medium in computer program operation is executed as weighed Benefit require any one of 1 to 7 described in the valley-fill method of energy storage based on load self-adapting.
CN201910733704.2A 2019-08-08 2019-08-08 A kind of valley-fill method and device of energy storage based on load self-adapting Pending CN110429628A (en)

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CN103311942A (en) * 2013-03-18 2013-09-18 国家电网公司 Control method of battery energy storage system for peak clipping and valley filling in distribution network
CN104167750A (en) * 2014-08-18 2014-11-26 国家电网公司 Distribution network peak load shifting distributed energy storage power distribution and coordination control method
CN109149651A (en) * 2018-10-19 2019-01-04 国网江苏省电力有限公司南通供电分公司 It is a kind of meter and pressure regulation ancillary service income light-preserved system optimizing operation method
CN109245135A (en) * 2018-08-15 2019-01-18 国网河南节能服务有限公司 Battery energy storage participates in the method and device of power grid peak load shifting scheduling

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6252310B1 (en) * 1999-07-28 2001-06-26 Nextek Power Systems, Inc. Balanced modular power management system and method
CN103311942A (en) * 2013-03-18 2013-09-18 国家电网公司 Control method of battery energy storage system for peak clipping and valley filling in distribution network
CN104167750A (en) * 2014-08-18 2014-11-26 国家电网公司 Distribution network peak load shifting distributed energy storage power distribution and coordination control method
CN109245135A (en) * 2018-08-15 2019-01-18 国网河南节能服务有限公司 Battery energy storage participates in the method and device of power grid peak load shifting scheduling
CN109149651A (en) * 2018-10-19 2019-01-04 国网江苏省电力有限公司南通供电分公司 It is a kind of meter and pressure regulation ancillary service income light-preserved system optimizing operation method

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